Casio CTK-50 Manuale utente
ELECTRIONIC KEYBOARD
CTK-50
CTK-50
(without price)
— 2 —
ELECTRICAL Nominal Limit
Current drain with 9V DC:
No sound output 50 mA 50 mA ±30%
Maximum volume 515 mA 515 mA ±30%
with keys C1, D1, E1 and F1 pressed
in Car-Horn tone, Volume; Maximum
Sound Pressure Level at 10 cm away from speaker: 108 dB 108 ±10 dB
with key C4 pressed in Car-Horn tone
Volume; Maximum
Minimum operating voltage: 5.8 V 6.0 V
GENERAL
Number of keys: 49
Polyphonic: 8-note
Preset tones: 100
Auto-rhythms: 100
Auto-accompaniment: CASIO Chord/Fingered
Demonstration tune: Classical Medley
Built-in speakers: 10 cm dia. 2.0W Input Rating: 1 pc.
Terminal: AC Adapter Jack (DC 9 V)
Power source: 2-way AC or DC source
AC: AC adapter
DC: 6 AA size dry batteries
Power consumption: 6.0 W
Dimensions: 79 x 766 x 269 mm (HWD)
(3-1/8 x 33 x 10-5/8 inches) (HWD)
Weight: 2.8 kg (6.2 lbs) excluding batteries
SPECIFICATIONS
CONTENTS
Specification.............................................................................. 2
Block Diagram........................................................................... 3
Circuit Description ..................................................................... 4
Troubleshooting ........................................................................ 7
Major Waveforms ...................................................................... 8
Schematic Diagrams ................................................................. 9
PCB View ................................................................................ 11
Exploded View ........................................................................ 12
Parts List ................................................................................. 13
— 3 —
BLOCK DIAGRAM
KO0~KO9
KI0~KI7
Keyboard
Switches
Oscillator
Q301, X301
VDD +5 V
Power supply circuit
Q101, Q102, D102
VC +9 V
Amplifier
A4598
IC101
Speaker
Filter
Q201
CPU
MSM6387-13
LSI201
Main Volume
AVDD +4.8 V
— 4 —
NOMENCLATURE OF KEYS
CIRCUIT DESCRIPTION
KEY AND SWITCH MATRIX
F#3 G#3 A#3 C#4 D#4 F#4 G#4 A#4 C#5 D#5 F#5 G#5 A#5
F3 G3 A3 B3 C4 D4 E4 F4 G4 A4 B4 C5 D5 E5 F5 G5 A5 B5 C6
D#3
C#3A#2G#2F#2
D#2
C#2
C2 D2 E2 F2 G2 A2 B2 C3 D3 E3
KI0 KI1 KI2 KI3 KI4 KI5 KI6 KI7
KO0 0 1 C2 C#2 D2 D#2 E2 F2
(KC1)
KO1 2 3 F#2 G2 G#2 A2 A#2 B2
(KC2)
KO2 4 5 C3 C#3 D3 D#3 E3 F3
(KC3)
KO3 6 7 F#3 G3 G#3 A3 A#3 B3
(KC4)
KO4 8 9 C4 C#4 D4 D#4 E4 F4
(KC5)
KO5 Tone Rhythm F#4 G4 G#4 A4 A#4 B4
(KC6)
KO6 Tempo Tempo C5 C#5 D5 D#5 E5 F5
(KC7) Up Down
KO7 Start/ Fill-In F#5 G5 G#5 A5 A#5 B5
(KC8) Stop
KO8 Demo C6
(KC9)
KO9 Normal Fingered CASIO
Chord
— 5 —
Pin No. Terminal In/ Out Function
1, 2 TEST1, TEST2 Not used. Connected to ground.
Power ON reset terminal. When the power switch is
3 RESET In turned on, the terminal receives a low level signal and
the internal circuits of the LSI are initialized.
4 AVDD In +5 V sorce for the built-in DAC
5 OUT Out Sound waveform output
6 AGND In Ground (0 V) source for the built-in DAC
7 GND In Ground (0 V) source
8 COSI In 21.725 MHz clock pulse input
9 COSO Not used.
10 VDD In +5 V source
11 ~ 18 KI0 ~ KI7 In Input terminals from keys and switches
19, 20 KO11, KO10 Not used.
21 ~ 30 KO9 ~ KO0 Out Key and switch scan signal outputs
CPU (LSI201: MSM6387-13)
The CPU contains a sound data ROM and a DAC (Digital to Analog Convertor), and it provides a sound
waveform in accordance with the pressed key and the selected tone.
The following table shows the pin functions of LSI201.
FILTER BLOCK
Since the sound signal from the CPU is a stepped waveform, the filter block is added to smooth the
waveform.
AVDD
C203
Q201
2SC1740SQ
R202
C202
AG AG
R204
R203
C201
To main volume
From CPU
— 6 —
Pin No. Terminal In/Out Functiion
1 Power GND In Ground (0 V) source
2 Ch1 B.S. Out Terminal for a bootstrap capacitor
3 Ch1 OUT Out Channel1 output
4 VCC In +9 V source. Connected to the power source directly.
5 Ch1 N.F. In Negative feedback input
6 Ch1 IN In Channel1 input
7 D.C. Out Terminal for a decoupling capacitor
8 Pre GND In Ground (0 V) source
9 Standby In Power control signal input. 0 V: OFF, +9 V: ON
10 Ch2 IN In Channel2 input
11 Ch2 N.F. In Negative feedback input
12 Ch2 OUT Out Channel2 output
13 Ch2 B.S. Out Terminal for a bootstrap capacitor
14 NC Not used.
POWER AMPLIFIER (IC101: LA4598)
The following table shows the pin functions of IC101.
6
5
8
7
10
11 13
12
9
4
1
3
2
Input
Amp. Pre-drive
Amp. Power
Amp.
TSD protector
Stand by
Bias circuit
Input
Amp. Pre-drive
Amp. Power
Amp.
Ch1 IN
Ch1 N.F.
Pre GND
D.C.
Ch2 IN
Ch2 N.F.
Ch2 B.S.
Ch1 OUT
Power GND
VCC
Standby
Ch2 OUT
Ch2 B.S.
Internal Block Diagram of IC101
— 7 —
Q101
2SD1858Q,R R116
D102
MTZ6.2A
R101
D103
LED101
D101
ON
Power Switch
VDD (+5.5 V)
VC (+9 V)
DC +9 V
Input
DG AG DG DG AG
C102
R115
R114
OFF Q102
2SC1740SQ D201
R208
AVDD (+4.8 V)
POWER SUPPLY CIRCUIT
The power supply circuit regulates two constant output voltages VDD (+5.0 V) for the CPU and the oscilla-
tor, and AVDD (+4.8 V) for the analog circuit.
TROUBLESHOOTING
Nature of Trouble Faulty Block Cause/Remedy
No power Power supply circuit Faulty Q101. Replace Q101.
Faulty D102. Replace D102.
Power switch Poor contact. Clean the contacts.
Power jack (J101) Open J101 or poor soldering. Replace
J101 or resolder.
No sound at all Power Amp (IC101: LA4598) Open or shorted IC101. Replace IC101.
CPU (LSI201: MSM6387-13) Faulty LSI201. Replace LSI201.
Oscillator Faulty Q301. Replace Q301.
Open X301. Replace X301.
Certain keys or switches Key and switch matrix Open circuit on KO or KI line.
do not function Replace keyboard PCB assembly.
CPU (LSI201: MSM6387-13) Faulty LSI201. Replace LSI201.
A certain key or switch Key and switch matrix Dust on the contact.
does not function
— 8 —
MAJOR WAVEFORMS
1
Clock pulse COSI
MSM6387-13 pin 8
2
3
Key scan signal KO0
MSM6387-13 pin 30
Key scan signal KO1
MSM6387-13 pin 29
4
5
6
7
Sound signal output
MSM6387-13 pin 5
Filter output
Emitter of Q201
Power amp input
LA4598 pin 6
Power amp output
LA5498 pin 3
Tone : Flute (No.13)
Key : A3
Volume : Maximum
12
3
4
5
6
7
50 ns
CH1: 1V
2 ms
CH1: 5 V
–CH2: 5 V
–
~
~~
2 ms
CH1: 50 mV CH2: 0.5 V
CH1: 50 mV CH2: 50 mV
2 ms
~~
CH1
CH1
CH2
CH1
CH2
CH1
CH2
— 9 —
SCHEMATIC DIAGRAMS
Keyboard PCB
— 10 —
Main PCB Notes:
1. All capacitance values are indicated in "µF" (p=10-6 µF).
2. All resistance values are indicated in "Ω" (k=103Ω, M=106Ω).
1
2
3
4
5
67
8.9 5.9 5.0
5.3
0.3 0.9
2.2
2.4
4.7
1.8
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